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Magnesium oxychloride cement-based straw light composite material and preparation method thereof

A technology of magnesium oxychloride cement and composite material, which is applied in the field of building thermal insulation materials, can solve the problems of unreasonable utilization, on-site incineration, pollution of the atmosphere, etc., and achieves the effects of low density, low bulk density, and good thermal insulation performance.

Inactive Publication Date: 2018-01-05
SHENYANG JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As agricultural waste, corn stalks have a huge annual output, but they have not been rationally utilized. They are abandoned in the field or even burned on the spot, seriously polluting the atmosphere

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] This embodiment provides a magnesium oxychloride cement-based straw lightweight composite material, and its preparation process is as follows:

[0017] (1) Crushing the corn stalks by a crusher to form straw fibers with a length of 10 mm;

[0018] (2) passing through a mesh sieve with a mesh number of 80 to remove the straw powder in the above-mentioned straw fibers;

[0019] (3) The raw materials are mixed according to the mass ratio, the lightly burned magnesium powder is 44.2 parts, the magnesium chloride is 11.4 parts, the water is 42.8 parts, the phosphoric acid is 0.4 parts, and the straw fiber volume ratio (that is, the straw fiber bulk volume: cement slurry volume)=1; make mixture;

[0020] (4) Adding hydrogen peroxide with a mass ratio of 1.1 in the above mixture, fully stirring to make it evenly foam;

[0021] (5) After the mixture is fully foamed, it is poured into the mold, and it is removed from the mold after 4 hours and maintained at normal room tempera...

Embodiment 2

[0023] This embodiment provides a magnesium oxychloride cement-based straw lightweight composite material, and its preparation process is as follows:

[0024] (1) Crushing the corn stalks by a crusher to form straw fibers with a length of about 15 mm;

[0025] (2) passing through a mesh sieve with a mesh number of 80 to remove the straw powder in the above-mentioned straw fiber;

[0026] (3) The raw materials are mixed according to the mass ratio, the lightly burned magnesium powder is 46.8 parts, the magnesium chloride is 10.3 parts, the water is 40.8 parts, and the phosphoric acid is 0.5 part; the volume ratio of the amount of straw is 1.25; the mixture is made;

[0027] (4) Add 1.6 parts of hydrogen peroxide in the above mixture, fully stir to make it evenly foam;

[0028] (5) After the mixture is fully foamed, it is poured into the mold, and it is removed from the mold after 4 hours and maintained at normal room temperature.

Embodiment 3

[0030] This embodiment provides a magnesium oxychloride cement-based straw lightweight composite material, and its preparation process is as follows:

[0031] (1) Crushing the corn stalks by a crusher to form straw fibers with a length of about 20mm;

[0032] (2) passing through a mesh sieve with a mesh number of 80 to remove the straw powder in the above-mentioned straw fiber;

[0033] (3) The raw materials are mixed according to the mass ratio, the lightly burned magnesium powder is 49.5 parts, the magnesium chloride is 13.3 parts, the water is 42.4 parts, and the phosphoric acid is 0.5 part; the straw volume ratio is 1.10; the mixture is made;

[0034] (4) Add hydrogen peroxide that accounts for 1.8 parts of the mass ratio of the mixture into the above mixture, and fully stir to make it evenly foam;

[0035] (5) After the mixture is fully foamed, it is poured into the mold, and it is removed from the mold after 4 hours and maintained at normal room temperature.

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Abstract

The invention belongs to the technical field of building heat-preservation materials and in particular relates to a magnesium oxychloride cement-based straw light composite material and a preparationmethod thereof. According to the technical scheme of the invention, the magnesium oxychloride cement-based straw light composite material comprises the following raw material components in parts by mass: 43-51 parts of caustic-burned magnesia powder, 10-15 parts of magnesium chloride, 40-44 parts of water, 0.40-0.53 part of phosphoric acid, 0.5-1.85 parts of hydrogen peroxide, and a straw fiber, wherein the volume ratio of the straw fiber to a cement paste is 0.75:1.25; the content of magnesium oxide of the caustic-burned magnesia powder is 95%; the activity of the caustic-burned magnesia powder is 68%. The magnesium oxychloride cement-based straw light composite material provided by the invention has the advantages of being green and environmentally friendly and good in heat preservationand thermal insulation.

Description

technical field [0001] The invention belongs to the technical field of building thermal insulation materials, and in particular relates to a magnesium oxychloride cement-based straw lightweight composite material and a preparation method thereof. Background technique [0002] Using melamine, phenolic resin, or urea-formaldehyde resin as adhesives to prepare composite materials and then make boards can easily release harmful substances and endanger human health. Moreover, this type of adhesive is flammable and poses a fire hazard. Some people use ordinary Portland cement and straw to prepare composite materials, but the smooth waxy layer on the surface of the composite material is not conducive to the interface bonding between straw and cement. affect the strength of composite materials. In addition, the segmented straw floats up during the mixing process, making it difficult to mix evenly. Adding corn stalks to ordinary Portland cement will reduce the strength of composite...

Claims

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Application Information

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IPC IPC(8): C04B28/32C04B18/24C04B111/40
CPCY02W30/91
Inventor 徐长伟许晨剑范朋朋
Owner SHENYANG JIANZHU UNIVERSITY
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